On September 25, 2012, Williams Partners L.P. (WPZ) increased its Aggregate Commitments (as defined in the Credit Agreement referred to herein) by $400 million (the Incremental
Commitments) under the terms of the Credit Agreement (as defined below). Portions of the Incremental Commitments are increased commitments from existing lenders under the Credit Agreement referred to below. The remainder of the Incremental
Commitments are new commitments from a financial institution that became a lender under the Credit Agreement pursuant to the First Amendment referred to below. Capitalized terms used herein and not otherwise defined have the meaning given to them in
the Credit Agreement, dated as of June 3, 2011 (as amended, modified and supplemented pursuant to the First Amendment referred to below, the Credit Agreement), among WPZ, Northwest Pipeline GP (Northwest) and
Transcontinental Gas Pipe Line Company, LLC (Transco and, together with WPZ and Northwest, collectively the Borrowers or each a Borrower), the lenders named therein and Citibank, N.A. (Citi), as
administrative agent. After giving effect to the First Amendment referred to below, the Borrowers may borrow up to $2.4 billion under the Credit Agreement.

On September 25, 2012, the Borrowers entered into a Commitment Increase and First Amendment Agreement (the First Amendment), with Citi, as administrative agent, the Issuing Banks, and the
lenders named therein, to effectuate the Incremental Commitments and to amend the Credit Agreement to provide that WPZ may request an increase in the commitments of up to an additional $400 million by commitments from either new lenders or increased
commitments from existing lenders in an amount such that the aggregate commitments under the Credit Agreement do not exceed $2.8 billion.

The foregoing description of the First Amendment does not purport to be complete and is qualified in its entirety by reference to the First Amendment, a copy of which has been filed as Exhibit 10.1 to
WPZs Current Report on Form 8-K filed on September 27, 2012 (File No. 001-32599) and incorporated into this Item 1.01 by reference. The First Amendment is filed as an exhibit to this Current Report on Form 8-K to provide investors
with the information regarding its terms. It is not intended to provide any other factual information about WPZ, Transco, Northwest or the other parties to the agreement or any of their respective subsidiaries or affiliates.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On September 25, 2012, WPZ, Northwest and Transco entered into the First Amendment as described under Item 1.01 above. The
description of the First Amendment under Item 1.01 above is incorporated into this Item 2.03 by reference.

Item 9.01.
Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number

Description

Exhibit 10.1

Commitment Increase and First Amendment Agreement, dated as of September 25, 2012, by and among Williams Partners L.P., Northwest Pipeline GP and Transcontinental Gas Pipe Line
Company, LLC, as co-borrowers, the lenders named therein, the Issuing Banks, and Citibank N.A., as administrative agent (filed on September 27, 2012 as Exhibit 10.1 to Williams Partners L.P.s Current Report on Form 8-K and incorporated herein
by reference).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

NORTHWEST PIPELINE GP

Date: September 27, 2012

By:

/s/ Lorna R. Simms

Lorna R. Simms

Assistant Secretary

INDEX TO EXHIBITS

Exhibit Number

Description

Exhibit 10.1

Commitment Increase and First Amendment Agreement, dated as of September 25, 2012, by and among Williams Partners L.P., Northwest Pipeline GP and Transcontinental Gas Pipe Line
Company, LLC, as co-borrowers, the lenders named therein, the Issuing Banks, and Citibank N.A., as administrative agent (filed on September 27, 2012 as Exhibit 10.1 to Williams Partners L.P.s Current Report on Form 8-K and incorporated herein
by reference).

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